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(N9 Modem R. ANDERSON.

TELEGRAPHIG TRANSMITTER.

No. 804,059. Patented Aug. 26, 1884.

IN VENTOR WITNESSES:

ihviirnn STATES PATNT rricno RUFUS ANDERSON, OF PEEKSKILL, NEVTYORK.

TELEGRAPHIC TRANSMITTER.

fiPifiCflF cA'llON forming part of Letters Patent No. 304,059, datedAugust 26, 1884.

(No model.)

To all whom it DMZ/5'] concern:

Be it known that I, Runes Anon-neon, a citizen of the United States, anda resident of Peekskill, county of W'estchester, and State of New York,have invented an Improvement in Key-Board Transmitters for TelegraphicPurposes, of which the following is a specification.

This invention relates to mechanism for making and breaking the circuitin telegraphic work where ordinarily a key is used, and has for itsobject the simplification of the act of transmission, so that no specialskill or knowledge on the part of the operator is required, so far asthe act of transmission is concerned. Said object is attained by akeyboard, a series of circuit-wheels, and an actuating friction-roller,arranged as hereinafter shown. A key-board, circuit-wheels, and afllCtlO1l-10ll6I have before been used for the same purpose; but thedevice necessitates an oscillating movement of the circuit-wheels as thefriction-roller revolves within the periphcry of said wheels, it notbeing possible therefore for the latter to make a complete revolution.This backward mot-ion of the circuitwheel involves a loss of time in theoperation of the machine. In my invention I overcome this difficulty byhaving the circuit-wheel revolve always in one direction.

In the drawings, Figure 1 is an end elevation of the essential parts ofthe invention. Fig. 2 is a perspective view of the sam c. Figs. 3 and 1:are views of details.

A is a rubber cylinder capable of revolving on its bearings a a, anddriven at a moderate speed by any suitable means.

13 B are key-levers pivoted at b. There are as many of these levers asthere are letters or characters to be transmitted, and they are arrangedin order at right angles to the cylinder A, and a little way above it,as shown. These key-levers are slotted in their middle to receive thedisk or roller C, which is pivoted at c. The disk C is of metal, and thelever B is so situated with reference to cylinder A as to allow thelower edge of disk to just touch barely, if at all, touches A. The upperpart of the disk 0 has a notch, n, Fig. 4, in which, when the disk is atrest, lies the small roller 1). This roller is pivoted in the end of aspring, (I, which has its other end rigidly secured to part of the frameat The tension of this spring is so adjusted that when the roller is inthe notch there is no tension, and the roller need not even touch thedisk; but if the notch n is moved away, as in Fig. 3, so the rollertouches the periphery of disk, the spring will then press downward. Onthe side of the disk 0 which is in the circuit through connection h arearranged the projections i, &c., that as they revolve touch the end ofthe spring f, (see Fig. 3,) and thereby close the circuit (throughconnection g) a length of time depending on the length of theprojection.

The operation of the machine is as follows: When motion (in direction ofarrow) is imparted to the cylinder A, the rest of the machine remainsquiescent, because the spring j keeps the disk 0 just clear of thecylinder; but when the key 13 is depressed, however slightly,thefriction between A 0 causes the latter to instantly begin to revolve,the notch in at once leaves the roller D, and the latter rides over thecircumference of C. The tension of the spring (I then keeps up thecontact between 0 and A, even when the finger or the pressure is removedfrom the key. This contact will continue till 0 makes a completerevolution; but so soon as the revolution is complete and the notch itgets to its starting-point the roller D drops in it, the pressure thatcaused. the contact between G and A ceases, and the disk stops. Duringthe revolution just described the circuit would be closed and opened inaccordance with the arrangement of the projections i i, 550. Aninstantaneous touch of the key is all that is necessary for each letter,and the depression need not exeeed one-sixteenth of an inch.

The roller A is preferably made, in part at least, of soft rubber.

If the support F is a non-conductor, the connection it might be madethrough ii, thence through roller D.

The contacts i maybe obtained either by notches in O, or projections, asshown.

To insure smooth movement when notch it passes over cylinder A, thenotch. is not cut clear through edge of disk, but as shown in Fig. 4:.

This machine is designed more particularly for a special kind oftelegraphic work; but it can be applied to ordinary Morse work by makingthe disks 0 of different diameters to correspond with the length of theletter so that if the keys are fingered properly there will be the sameinterval between all letters, whether long or short.

The roller D may be dispensed with, and the end of the spring (I be usedin its place; but the disk will evidently require less to drive it if Dis used; or the roller and spring both might be dispensed with andfriction between C and A be obtained by the pressure of the finger only,the motion being limited to one revolution by other means, one of whichmight be by a fiatted spot on circumference of disk, which, when it cameto A, would stop the contact.

volving cylinder, a series of circuit-wheels mounted on key-levers, saidcircuit-wheels revolving in one direction only, on being brought intocontact with the periphery of said cylinder by the action of saidkey-levers, substantially as described.

2. In an automatic telegraphic transmitter, he cylinder A, the key-leverB, the disk 0, having notch n, the roller D, and the spring (2, combinedas set forth.

3. In an automatic telegraphictransmitter, the cylinder A, the key-leverB, the disk 0, having notch or, and contacts a i, the roller D, springcl, and the contact-spri n g f, substantially as set forth. RUFUSANDERSON. Vitnesses:

FRANKLIN CoUcn, NELSGN G. FosnoY.

